Allen Bradley 1494V series variable depth flange mounted isolation switch

Accessory system and selection requirements

（1） Classification of core accessories

Operation category: Handle (divided into spray painted/stainless steel/plastic according to material, H1/H2, F-P1/M1/S1 series according to current level), connecting rod (divided into RA/RB series according to length and current level, multiple high current kits need to be matched).

Protection category: Fuse cover (classified by series and left and right hands into models N56/N59/N61-N68, etc., to prevent accidental contact with live parts).

Auxiliary function category: auxiliary contacts (normally open/normally closed, such as 595-A/B, 1495-N8/N9), adapters (dedicated for left-hand switches, 1495-N24/N25).

（2） Key selection rules

Series matching: The isolation switch and trailer type fuse block must have the same series letter (such as Series D switch with Series D fuse block), otherwise they cannot be assembled properly.

Current adaptation: The fuse clip, handle, and connecting rod should be selected according to the rated current of the isolation switch (for example, H2/W2 series handles are required for 400A/600A, and H1 series handles with 30A cannot be used).

Differentiation between left and right hands: Left hand switches require additional ordering of corresponding adapters, and accessories (such as fuse covers) are divided into left and right hand specific models. The installation direction needs to be clarified before selection.

Product advantages and expansion series

（1） 1494V series core advantages

Reliability: Adopting a sturdy structure and mature design, with a long service life; Compliant with multiple international standards, there is no lag in the "on/off" position during operation (snap action design), avoiding misoperation.

Security: Visible blade structure, power off status is intuitively visible; The flange structure ensures that the switch and handle are always connected (in accordance with NFPA 79 standard), and an optional fuse cover prevents accidental contact with live parts.

Flexibility: Supports multiple types of fuses, accessories can be ordered separately or purchased as a kit, suitable for different installation depths, and compatible with multiple protection levels of enclosures.

（2） Related extended product series

At the end of the document, Allen Bradley's other isolation switch series were added for users to expand their selection as needed:

1494C series: Cable operation flange installation isolation switch (30A-400A, cable length 3 '-10').

1494G series: Closed safety isolation switch (30A-600A, 2/3/6 poles, multiple shell materials and protection levels).

1494F series: Fixed depth flange mounted isolation switch (30A-200A, compatible with NEMA 1/12 enclosure).

1494D series: Fixed depth flange mounted circuit breaker operating mechanism (125A-1200A, compatible with circuit breaker frame).

Precautions for use and maintenance

Pre installation inspection: Confirm that the isolation switch series matches the fuse block and accessory model, and that the left-hand switch is equipped with the corresponding adapter.

Operation specifications: The handle and connecting rod can only be replaced within the same kit, and cannot be mixed across current levels or series to avoid mechanical failure.

Regular maintenance: Check if the fuse cover is intact and if the auxiliary contact is reliable. For high current kits (400A/600A), it is necessary to regularly check the fastening status of the connecting rod to prevent overheating and loosening.